As part of the restructuring of men’s tennis in 2009, the Barclays ATP World Tour Finals will replace the Tennis Masters Cup, currently held in Shanghai, as the year ending finale of the ATP World Tour. With only the year’s top 8 singles players and doubles teams in the world, including the Grand Slam champions, qualifying to compete, it is the year’s climactic final event that determines the official year-end South African Airways ATP World Tour Rankings.